Cowpokes and caballeros,
YES, this is a class assignment, but your responses will not improve my grade - only my personal understanding of
Java.
I wrote a program that is supposed to encode/decode files according to my own encoding scheme. I decided to convert each character's ASCII code to Hex, reverse the Hex digits, and then convert the Hex back to a char. For example - A (65 ASCII) -> 41 (in Hex) -> 14 (reversed Hex) -> � (20 ASCII).
This scheme works perfectly EXCEPT that it seems to spaz when reading characters with ASCII codes from 128 through 159 (80 through 9F in Hex). I'm reading files into a char array using a BufferedReader's read(char[], int, int) method. Any and all help is appreciated.
Andrew
Here's the code without comments and with compacted formatting:
import java.io.*;
public class P5 {
public static void main(
String[] args) {
P5 myApp = new P5();
myApp.run(args[0]); }
public void run(String filename) {
char[] originalFile = null;
char[] newFile = null;
//read the file
{//Set up the arrays to be the correct length
File theFile = new File(filename);
originalFile = new char[(int)theFile.length()];
newFile = new char[(int)theFile.length()]; }
{//Perform the actual read
BufferedReader fileInput = null;
try {
fileInput = new BufferedReader(new FileReader(filename));
fileInput.read(originalFile, 0, originalFile.length); }
catch (EOFException eof) {
/*we want this to happen!*/ }
catch (Exception e) {
System.out.println(e.getMessage()); } }
//en/decrypt
for (int i = 0; i < originalFile.length; i++) {
int sixteensPlace = 0, onesPlace = 0;
sixteensPlace = ( (int)originalFile[i] / 16 );
onesPlace = ( (int)originalFile[i] % 16 );
newFile[i] = (char)( (onesPlace * 16) + sixteensPlace );
//the next line is for debugging
System.out.println(originalFile[i] + "=" + (int)originalFile[i] + "=" + sixteensPlace + "." + onesPlace + " -> " + (int)newFile[i] + "=" + newFile[i]); }
//write the new file
{BufferedWriter fileOutput = null;
try {
fileOutput = new BufferedWriter(new FileWriter(filename + "_enc"));
fileOutput.write(newFile, 0, newFile.length);
fileOutput.close(); }
catch (Exception e) {
System.out.println(e.getMessage()); }
}
}
}
